乗算¶
V2.4.11, V3.0.0¶
Link OpenCV API Reference.
In [2]:
# -*- coding: utf-8 -*-
import cv2
import numpy as np
#Ipythonで表示用の設定
import matplotlib.pyplot as plt
%matplotlib inline
#画像読込(画素値1/4)
img1 = cv2.imread("baboon.jpg")/4
#乗算用画像生成
img2 = np.ones((512,512,3),dtype='uint8')
img2[0:256,0:256] =1
img2[256:512,0:256] =4
img2[0:256,256:512] =2
img2[256:512,256:512] =3
#画像の乗算
dst = cv2.multiply(img1,img2)
#OpenCVがBGRなのでRGBに変換
disp_img1 = cv2.cvtColor(img1, cv2.COLOR_BGR2RGB)
disp_dst = cv2.cvtColor(dst, cv2.COLOR_BGR2RGB)
print img1[400,400],"*",img2[400,400],"->",dst[400,400]
#画像表示
plt.figure(figsize=(10,4))
plt.subplot(121)
plt.imshow(disp_img1)
plt.subplot(122)
plt.imshow(disp_dst)
Out[2]:
